/// <summary>
/// 执行属性查询
/// 尚未实现如何闪烁选中要素集合
/// 以及进度条的显示
/// </summary>
/// <param name="searchLayers"></param>
private void ExecuteIdentify(List<LayerFilterProperties> searchLayers, IGeometry identifyGeom)
{
object Missing = Type.Missing;
//清空以前所有的查询结果先
identifiedResultsList.Clear();
//用于计算查询得到的要素的数量
int identifiedObjCount = 0;
//获取用于查询的图层的数量
int searchLayersCount = searchLayers.Count;
//初始化进度条
IdentifyProgress.Visible = true;
IdentifyProgress.Maximum = searchLayersCount;
//初始化闪烁对象
flashObjects.MapControl = associateMapControl.Object as IMapControl2;
flashObjects.Init();
//遍历所有图层
for (int i = 0; i < searchLayersCount; i++)
{
LayerFilterProperties filterProps = searchLayers[i];
ILayer layer = filterProps.TargetLayer;
//新建查询结果列表对象
LayerIdentifiedResult layerIdentifiedResult = new LayerIdentifiedResult();
//先保存查询图层对象
layerIdentifiedResult.IdentifyLayer = layer;
layerIdentifiedResult.GeometryType = filterProps.LayerFeatureType;
//首先获得查询结果列表对象，以备后面往里添加结果使用
List<IFeatureIdentifyObj> identifiedObjList = layerIdentifiedResult.IdentifiedFeatureObjList;
//执行查询，返回查询结果
IArray identifyResult = Identify(layer, identifyGeom);
//处理异常情况
if (identifyResult != null)
{
//依次获取每一个查询结果对象
for (int k = 0; k < identifyResult.Count; k++)
{
identifiedObjCount++;
IFeatureIdentifyObj identifiedFeatureObj = identifyResult.get_Element(k) as IFeatureIdentifyObj;
//闪烁要素
IFeature identifiedFeature = (identifiedFeatureObj as IRowIdentifyObject).Row as IFeature;
//添加闪烁图形
flashObjects.AddGeometry(identifiedFeature.Shape);
//保存查询结果
identifiedObjList.Add(identifiedFeatureObj);
}
identifiedResultsList.Add(layerIdentifiedResult);
}
//显示查询进度
IdentifyProgress.Value = i + 1;
Application.DoEvents();
}
//隐藏进度条
IdentifyProgress.Visible = false;
//显示查询到的要素数量
lblFeatureCount.Text = "查询到 " + identifiedObjCount + " 条记录";
}
/// <summary>
/// 显示指定要素的属性
/// </summary>
/// <param name="identifiedFeature"></param>
private void ShowFeatureAttributes(IFeature identifiedFeature, LayerIdentifiedResult layerResult)
{
ArcGisPublic agp = new ArcGisPublic();
ifeat = identifiedFeature;
pFeatureLayer = agp.GetLayerByName(associateMapControl,layerResult.IdentifyLayer.Name) as IFeatureLayer;
if (identifiedFeature == null)
{
//初始化属性列表
InitializeAttributesList();
return;
}
//清空数据列表
lstProperties.Items.Clear();
lstProperties.Columns.Clear();
//若查询数据不为空则显示数据
//添加列头
ColumnHeader fieldHeader = new ColumnHeader();
fieldHeader.Text = "字段名";
fieldHeader.Width = 85;
ColumnHeader valueHeader = new ColumnHeader();
valueHeader.Text = "属性值";
valueHeader.Width = lstProperties.Width - fieldHeader.Width - 25;
lstProperties.Columns.AddRange(new ColumnHeader[] { fieldHeader, valueHeader });
//添加值对
IFields fields = identifiedFeature.Fields;
//几何图形
IGeometry shape = identifiedFeature.Shape;
for (int i = 0; i < fields.FieldCount; i++)
{
IField field = fields.get_Field(i);
ListViewItem lvi = new ListViewItem(field.AliasName);
string fieldValue = string.Empty;
if (field.Type == esriFieldType.esriFieldTypeGeometry)
{
fieldValue = shape.GeometryType.ToString().Substring(12);
}
else
{
fieldValue = identifiedFeature.get_Value(i).ToString();
}
lvi.SubItems.Add(fieldValue);
lstProperties.Items.Add(lvi);
}
}
public void FlashObjects(LayerIdentifiedResult layerFlash)
{
screenDisplay.StartDrawing(screenDisplay.hDC, (System.Int16)ESRI.ArcGIS.Display.esriScreenCache.esriNoScreenCache);
switch (layerFlash.GeometryType)
{
case LayerFeatureType.Point:
screenDisplay.SetSymbol(pointSymbol);
break;
case LayerFeatureType.Polyline:
screenDisplay.SetSymbol(lineSymbol);
break;
case LayerFeatureType.Polygon:
screenDisplay.SetSymbol(regionSymbol);
break;
default:
return;
}
List<IFeatureIdentifyObj> identifyObjDefault = layerFlash.IdentifiedFeatureObjList;
for (int i = 0; i < identifyObjDefault.Count; i++)
{
IFeature featureDefault = (identifyObjDefault[i] as IRowIdentifyObject).Row as IFeature;
switch (layerFlash.GeometryType)
{
case LayerFeatureType.Point:
screenDisplay.DrawPoint(featureDefault.Shape);
break;
case LayerFeatureType.Polyline:
screenDisplay.DrawPolyline(featureDefault.Shape);
break;
case LayerFeatureType.Polygon:
screenDisplay.DrawPolygon(featureDefault.Shape);
break;
}
}
Thread.Sleep(500);
screenDisplay.FinishDrawing();
mapControl2.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewForeground, null, null);
}
